Open ADOC files online
AsciiDoc is a rich plain-text authoring format, more capable than Markdown, popular for technical documentation.
Drop a ADOC file to open it
or click to choose — everything stays on your device
Choose file🔒 100% private — files never leave your browser
You can also edit ADOC online — change the content with find & replace, then save it back. Nothing is uploaded. Or turn ADOC into an image — snapshot the preview, add arrows or notes, and download a PNG.
What is a ADOC file?
AsciiDoc is a rich plain-text authoring format, more capable than Markdown, popular for technical documentation. The .ADOC extension identifies a AsciiDoc file, which is served with the text/asciidoc media type. You can open it here instantly — drop the file into the box above and it renders in your browser. Nothing is uploaded.
Besides this free online viewer, you can open AsciiDoc files in desktop apps such as VS Code, Asciidoctor — but here all you need is a web browser.
Quick facts
| Format | AsciiDoc — AsciiDoc |
|---|---|
| File extensions | .adoc .asciidoc |
| MIME type | text/asciidoc |
| Developer | Stuart Rackham |
| Category | Text & markup |
| Also opens in | VS Code, Asciidoctor |
How to open a ADOC file online
- Click Choose file above, or drag your ADOC file onto the box.
- The right viewer loads automatically and renders your file.
- Read, scroll or page through it. To open a different file, choose Open another file.
100% private — files never leave your browser.
Libraries used to render ADOC in the browser
This viewer is built entirely with open-source JavaScript that runs in your browser:
Frequently asked questions
What is a .ADOC file?
A .ADOC file is a AsciiDoc, identified by the text/asciidoc media type. You can open and read it instantly in the viewer above without installing anything.
What programs open ADOC files?
On the desktop, ADOC files typically open in VS Code, Asciidoctor. Online, this page opens them in any modern browser — nothing to download.
Can I edit a ADOC file online?
Yes. Open your file, switch to Edit, change the text with built-in find & replace, then click Save. It all runs in your browser — nothing is uploaded.
How do I convert ADOC to an image?
Use Snapshot to capture the ADOC preview, optionally add arrows, text or highlights, then download it as a PNG image.
Is it safe to open my ADOC file here?
Yes. The file is read and rendered entirely by JavaScript inside your own browser. It is never uploaded to a server, so nothing leaves your device.
Do I need to install anything to view a ADOC file?
No. There is nothing to install and no account to create. Open the page, drop your file, and it displays instantly.
Does it work on my phone or iPad?
Yes. The viewer is fully responsive and works in modern mobile and tablet browsers such as Safari and Chrome.
Is there a file size limit?
There is no hard limit, but very large files depend on your device’s memory. Big files are processed in the background so the page stays responsive.